Improved process for producing foamed aluminum by adopting ultrasonic melt-foaming method

Abstract

The invention discloses an improved process for producing foamed aluminum by adopting an ultrasonic melt-foaming method. The process comprises the following steps: based on an ultrasonic cavitation effect and a mechanical crushing effect, adding a TiH2 foaming agent into an aluminum alloy melt, stirring, and simultaneously emitting ultrasonic waves into the aluminum alloy melt; fully dispersing TiH2 foaming agent particles by virtue of the ultrasonic waves, so that more bubble nucleation is generated and more fine bubbles are produced. Meanwhile, the formed bubbles are crushed by utilizing the ultrasonic cavitation effect, and more fine bubbles are formed, so that the aim of refining the foamed aluminum bubbles is achieved. In the heat insulation foaming process, the ultrasonic waves are continuously emitted into the aluminum alloy melt, and fine bubbles are maintained, so that the bubbles do not rapidly float upwards due to the action of the surface tension, and the mechanical property and density uniformity of the foamed aluminum are improved. Meanwhile, in the aluminum alloy solidification process, the aluminum alloy structure is refined by virtue of the action of the ultrasonic waves, and the performance of an aluminum alloy matrix is improved.

Description

Technical field: [0001] The invention belongs to the field of metal material processing technology, and in particular relates to an improved technology for producing foamed aluminum by means of an ultrasonic melt foaming method. Background technique: [0002] Aluminum foam is made by adding additives to pure aluminum or aluminum alloy and undergoing a foaming process, which has both metal and bubble characteristics. It has the characteristics of small density, high impact absorption ability, high temperature resistance, strong fire resistance, corrosion resistance, sound insulation and noise reduction, low thermal conductivity, high electromagnetic shielding, and strong weather resistance. Sound insulation, building fire protection and other fields have been applied. [0003] The energy absorption of aluminum foam has good rate-strain characteristics, that is, the greater the strain rate, the greater the energy absorbed per unit volume of aluminum foam, up to 8-30J / cm 3 . ...

AI Technical Summary

Problems solved by technology

The foaming temperature of the foaming agent is lower than the temperature of the aluminum alloy solution, so the powdered foaming agent begins to decompose violently before it is fully dispersed, releasing gas, which affects the further dispersion of powder particles and causes the foaming agent to concentrate , causing the bubbles to be too large

When the bubbles are too large, the stress of the aluminum alloy material will be too concentrated, thereby reducing the mechanical properties of the foamed aluminum material

At the same time, during the foaming process, the larger bubbles generated are more likely to float up in the aluminum solution, resulting in uneven density and porosity of the foamed aluminum, reducing the yield and increasing the cost in the production process